function wrap(text, width) {
let totalLines = 1;
text.each(function() {
let text = d3.select(this),
words = text.text().split(/\s+/).reverse(),
word,
line = [],
lineNumber = 0,
lineHeight = 1.1,
x = text.attr("x"),
y = text.attr("y"),
dy = parseFloat(text.attr("dy")),
tspan = text.text(null)
.append("tspan")
.attr("x", x)
.attr("y", y)
.attr("dy", dy + "em");
while (word = words.pop()) {
line.push(word);
tspan.text(line.join(" "));
if (tspan.node().getComputedTextLength() > width) {
line.pop();
tspan.text(line.join(" "));
line = [word];
tspan = text.append("tspan")
.attr("x", x)
.attr("y", y)
.attr("dy", ++lineNumber * lineHeight + dy + "em")
.text(word);
totalLines = Math.max(totalLines, lineNumber + 1);
}
}
});
return totalLines;
}